package com.atguigu.lease.web.admin.custom.interceptor;

import com.atguigu.lease.common.context.LoginUser;
import com.atguigu.lease.common.context.LoginUserContext;
import com.atguigu.lease.common.exception.LeaseException;
import com.atguigu.lease.common.result.ResultCodeEnum;
import com.atguigu.lease.common.utils.JwtUtil;
import io.jsonwebtoken.Claims;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;


import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;

@Component
@Slf4j
public class AuthenticationInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        String token = request.getHeader("access_token");
        if(token==null){
            throw new LeaseException(ResultCodeEnum.APP_LOGIN_AUTH);
        }
        else {
            Claims claims = JwtUtil.parseToken(token);
            Long userId = claims.get("userId",Long.class);
            String username = claims.get("username",String.class);
            LoginUserContext.setLoginUser(new LoginUser(userId,username));
        }
        return true;
    }
//因为每次进行请求时都要进行jwt的验证解析，所以在进行赋值后这个请求结束也就是当前请求不需要时就要清楚这个线程的变量方便下次请求的使用
    //避免每次请求都要解析两遍只需要一次验证jwt就可以的
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        LoginUserContext.clear();
    }
}
